The work proposed by this expedition has attracted the attention and held the interest of scientists everywhere, and material aid from several scientific bodies has already been pledged toward the securing of the necessary funds for transporting the party to the field of its labors, and its maintenance while at work there. The observers will be selected from among the officers of the United States Navy attached to the Coast Survey, who have had special training in magnetic field work. That bureau will also provide the necessary instruments, but, in the absence of any appropriation that could be applied to the transportation and maintenance of the party in the field, the funds for that purpose have to be obtained by the voluntary contribution of those with means and inclination to aid so important an enterprise. Said the late Professor Trowbridge of Columbia College, in a lecture upon the data to be obtained by this expedition for subsequent expert discussion, "We are living in an epoch in the world's history when man is struggling for a higher and more perfect life, not only against the degrading tendencies of his inherited nature, but to make the forces of nature subservient to his advancement and well being. Among these forces there are none which seem to affect or control the conditions of animal life on the earth more than heat, light, electricity, and magnetism, all, perhaps, the manifestations of one cosmical agent. As the variations of the magnetic force appear to follow lesser and greater cycles, it is not impossible that nearly all terrestrial phenomena, which depend on causes allied to magnetism, follow similar cycles. We can now predict the course of storms; may we not hope to determine their origin and predict their recurrence, as far as they depend upon the forces which have been mentioned? A knowledge of the laws of the cycles through which these forces pass is the first and only step in this direction to be taken, and this step must be made by patient, long-continued observations." [Illustration: PROFESSOR T. C. MENDENHALL.] An immediate practical use of the observations to be made is their application to the correction of compass errors. Every one can see that such work as tends to render the mariner's compass a more reliable instrument must be of immediate and direct benefit, not only to the sailor, but to the surveyor on land. Admitting that the observations of such an expedition as that to the North Magnetic Pole will be of scientific and general value, it remains to explain something of the personnel of the party, how the work is to be conducted, and by what route it will reach the field of its labor.